Actually that version of Erin's from 2002 needs to be updated... It still has USEF listed as US--... ohhhhh whatever it was for the 10 minutes it wasn't AHSA or USEF! ... And USHJA is listed as something else it once was & isn't anymore, too.
That's true! Well, maybe it would still come in handy if someone was making a historical reference! This does remind me that there was a fairly recent thread about this topic that I wanted to save/move somewhere for reference...
I'll post an update when/if I find it.
ETA (edited to add ): Found the thread, moved it to Reference and added a post with a link to it to the thread I referenced earlier.